Department of Emergency Medicine, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, People’s Republic of China Emergency Medicine and Difficult Disease Institute, The ...

During the menstrual phase (day 1–5), when oestrogen and progesterone are at their lowest, gentle movement is key. Think: walking, yin yoga, or light stretching. It’s about restoration, not exertion.

But wait, do you remember that book about the river and the source? In biological terms, the source of the river called femininity is a hormone called oestrogen. Men and women produce it, but it is in ...